HarmonyOS 如何限制TextInput的规则？

@Entry  
@Component  
struct TextInputExample {  
  @State message: string = ''  
  controller: TextInputController = new TextInputController()  
  build() {  
    Column() {  
      TextInput({placeholder: '请输入内容', text: this.message })  
        .width('100%')  
        .type(InputType.NUMBER_DECIMAL)  
        .maxLength(11)  
        .backgroundColor(Color.Green)  
        .onChange((value) => {  
          this.message = value  
          let reg = new RegExp('^(([1-9]{1}\\d*)|([0]{1}))(\\.(\\d){0,2})?$')  
          let res = reg.test(value)  
          if (!res) {  
            this.message = value.substring(0, value.length - 1)  
          } else {  
            this.message = value  
          }  
        })  
    }  
  }  
}